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Imaging device and focus control method

a focus control and imaging device technology, applied in the field of imaging devices and focus control methods, can solve the problems of unnecessarily performing correlation operations and inability to say that the operation for phase difference af is efficiently performed, and achieve the effect of high-speed phase difference and efficient operation

Active Publication Date: 2016-08-30
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide an imaging device and focus control method that can increase the speed of phase differenceAF by efficiently performing the operation of phase difference amount. The technical effect of the invention is to improve the precision of phase differenceAF while reducing redundant operations.

Problems solved by technology

However, redundant operation may be performed for the phase difference AF so that it cannot say that the operation for the phase difference AF is efficiently performed.
However, in Patent Literatures 1 and 3, regardless of the state of the subject, L is constant, so that the correlation operation may be unnecessarily performed.

Method used

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  • Imaging device and focus control method
  • Imaging device and focus control method
  • Imaging device and focus control method

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Experimental program
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first modified embodiment

[0103]In the digital camera illustrated in FIG. 1, the imaging element driving unit 10 drives the solid-state imaging element 5 in a rolling shutter manner. In the rolling shutter manner, exposure timings for every pixel row are slightly shifted. Therefore, when the subject is moving, even though the two pixel rows are adjacent to each other, a distortion of an image caused by the rolling shutter driving may be formed between the output signal groups obtained from the two pixel rows as a phase difference in some cases.

[0104]Therefore, when a phase difference D caused by the rolling shutter driving is generated, even when S[D] is at a minimum in d=L or d=−L, actually, S[L+D] or S[−(L+D)] may be smaller than the minimum S[d].

[0105]Therefore, in the first modified embodiment, the defocus amount calculating unit 19 calculates a shift amount L′ obtained by adding the phase difference D caused by the rolling shutter driving to the value of the shift amount L determined in accordance with ...

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Abstract

An imaging device, includes: a sensor including first phase difference detecting pixels arranged in a row direction and second phase difference detecting pixels arranged in the row direction; a defocus amount calculating unit which calculates a correlated amount of a first output signal group and a second output signal group while shifting the first output signal group and the second output signal group in the row direction by an arbitrary amount to calculate a defocus amount from a first shift amount of the first output signal group and the second output signal group when the correlated amount is at a maximum. The defocus amount calculating unit changes an upper limit of a shift amount of the first output signal group and the second output signal group in accordance with at least one of an F value, a focal distance, and a position of a focus lens.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This is a continuation of International Application No. PCT / JP2013 / 065022 filed on May 30, 2013, and claims priority from Japanese Patent Application No. 2012-196094, filed on Sep. 6, 2012, the entire disclosures of which are incorporated herein by reference.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to an imaging device and a focus control method.[0004]2. Related Art[0005]Recently, as the resolution of a solid-state imaging element such as a charge coupled device (CCD) image sensor and a complementary metal oxide semiconductor (CMOS) image sensor becomes higher, a demand for an information device having a photographing function such as a digital still camera, a digital video camera, a cellular phone such as a smart phone, and a personal digital assistant (PDA) is rapidly increasing. In the meantime, the information device having an imaging function as described above is referred to as an imaging device.[0006]In ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04N5/232G03B13/36H04N5/369G02B7/34H04N101/00
CPCG02B7/34G03B13/36H04N5/23212H04N5/3696H04N2101/00G03B2206/00H04N23/672H04N23/633H04N23/631H04N25/704H04N25/134
Inventor ENDO, HIROSHI
Owner FUJIFILM CORP